Lewisham East MP Heidi Alexander is reported to be considering a move to City Hall, which would trigger a local by-election. Guido Fawkes summarises:"Last night the Guardian reported that Labour MP Heidi Alexander is “seriously considering” quitting the Commons for a job at City Hall. This morning the Corbynista site Skwawkbox (health warnings apply) say she is to step down. Labour’s press office say they aren’t commenting and that Guido should speak to Heidi. Calls to her mobile, Westminster and constituency office phones are going unanswered. By-election?"

Since quitting the shadow cabinet in protest at Corbyn’s leadership in July 2016, Alexander has come under pressure from pro-Corbyn campaign group Momentum, including some local activists who are also members of the far left Alliance for Workers’ Liberty. The influx of new members has sometimes represented a direct challenge, with local members vocally objecting to her decision to quit the shadow cabinet. Momentum’s position is stronger in the neighbouring constituency of Lewisham Deptford; however, the campaign group last week launched a Lewisham East left caucus, to “help comrades build a strong left in the remaining stronghold of the Labour right in Lewisham”.